Q. A given system undergoes a change in which the work done by the system equals the decrease in its internal energy. The system must have undergone an
A) Isothermal change
B) Adiabatic change
C) Isobaric change
D) Isochoric change
Explanation
(b) According to first law of thermodynamics,
$dQ = dU + dW$
As $dW = - dU$
$dQ = dU - dU = 0$
The change must be adiabatic
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.